Fuse



Jan. 6, 19 42. w. o. SCHULTZ FUSE 4 Sheets-Sheet 1 Filed Dec. 4, 1939INVENTOR. I V/JA/AM 0. 30/1/01 Jan. 6, 1942.

W. O. SCHULTZ FUSE Filed Dec. 4, 1939 4 Sheets-Sheet 2 INVENTOR.

W\ ATTORNEY.

w. o. SCHULTZ 2,269,130

' FUSE Filed Dec. 4, 1959 4 Sheets-Sheet 4 f1 I 1 I w 4 2 I W v j] ifINVENTOR.

14/41/444 0. SCf/l/ZTZ ATTO/PIYEK Patented Jan. 6, 1942 FUSE William 0.Schultz, South Milwaukee, Wis., assignor to Line Material Company, SouthMilwaukee, Wis., a corporation of Delaware Application December 4, 1939,Serial No. 307,350

(Cl. 200l14) 16 Claims.

dragging over the-end of the fuse tube and also permitting the use ofrelatively still ,fuse link leaders if so desired.

In greater detail, further objects are to pro vide a fuse link flip-outdevice and a fuse tube releasing device which is so made that it quicklyand forcibly withdraws the unburned portion of the fuse link, therebysecuring a quick interruption of the circuit within the fuse tubeitself, which thereafter releases the fuse tube and allows the fuse tubeto drop or rock outwardly from operative to inoperative position.

Further objects are to provide a fuse construction in which a quickoperating fuse link flip-out device is provided for quickly withdrawingany remaining portion of the fuse link, and to so construct the fuselink flip-out device that it has very little weight and may be quicklyoperated by spring means independent of any motion of any of the otherportions of the apparatus.

Further objects are to provide a construction in which the fuse linkflip-out device acts as a spring cushioning means for taking up anyslack in the fuse link after re-fusing, and which acts asa cushioningmember when the fuse device is suddenly rocked back into closedposition, thereby preventing transmission of any undue stress to thefuse link itself.

Further objects are to provide a drop-out fuse construction which may beeither housed or unhoused, in which the fuse tube is pivotally mountedon a supporting lever, the supporting lever in turn being pivotallymounted on a stationary support; and in which the fuse link flipoutdevice is pivotally mounted on the supporting lever, the fuse linkflip-out device being spring biased with respect to the lever and having motion independent of the lever and being of relatively light weightso that a very quick acting device is provided. and to provide aconstruction in which the supporting lever may be freely removed from orrepositioned within the lower supporting means without any hindrancefrom the fuse link flip-out device.

Embodiments of the invention are shown in the accompanying drawings, inwhich:

Figure 1 is a side elevation showing the invention as applied to adrop-out unhoused fuse.

Figure 2 is a fragmentary view of the lower portion of Figure 1, showingin full lines the position of the parts after the fuse link has rupturedand the fuse tube has moved part of the way outwardly and downwardly andshowing in broken lines the final position of the fuse tube.

Figure 3 is an enlarged view of the fuse tube removed from the rest ofthe apparatus, such view having parts broken away and in section.

Figure 4 is a view of the lower portion of Figure 3 taken at rightangles thereto.

Figure 5 is a bottom view of the structure shown in Figure 3.

Figure 6 is a vertical sectional view showing the invention as appliedto a housed type of drop-out fuse.

Figure 7 is a view showing the housed type of drop-out fuse mounted inan angular position.

Figure 8 is a fragmentary view showing a further form of the invention.

Figure, 9 is a bottom view of the structure shown in Figure 8.

Figure 10 is a fragmentary view showing a still further form of theinvention.

Figure 11 is a bottom view of the structure shown in Figure 10.

Referring to Figures 1 to 5, it will be seen that the device comprises afuse tube I which is mounted between upper and lower terminal members 2and 3 carried by any suitable support. for instance upper and lowerinsulators I and I which are in turn carried by a channel member 8. Thechannel member may be supported from any suitable point in the usualmanner. If'desired, the fuse tube may be mounted in the angular positionshown or may be mounted vertically.

The fuse tube is provided with an upper contact I having a flat rearface 3 against which a brush contact or spring contact 9 firmly bears,such brush contact forming a portion of the upperterminal member.

The upper contact of the fuse tube includes a cap it which is screwed onthe portion I and clamps the buttonhead of the fuse link in place,

as shown most clearly in Figure 3. The cap It is provided with anintegral hind a shouldered portion member l2. indicated at pin II whichfits beof a pivoted latch The latch member is pivoted, as It, to theupper terminal member and is of hood-like construction, shielding theupper contact of the fuse tube and the brush contact and acting in themanner of a sleet hood.

It is provided with a cam poi tion l4 so as to raise it when the fusetube is being rocked back into position. The shouldered portion |5 dropsdownwardly in front of the pin II when the fuse tube is in its finalposition. The sleet hood or upper latch |2 may be provided with a stop|6 to limit its downward rocking motion.

It is obvious that other forms of contacts could be employed and otherforms of latching means without departing from the spirit of thisinvention. Any of the usual forms well known in the art could beemployed.

Means are provided for releasing the latch member manually if sodesired, and may comprise an eyelet portion |1 adapted to receive aswitch stick and pivoted at H! upon upper contact 1. This releasingmember is provided with a pair of arms l9 located on opposite sides ofthe contact 1 and directly beneath the sleet hood or upper latch |2 sothat when the eyelet member is pulled downwardly, it raises the latchand releases the fuse and allows the fuse tube to be swung outwardly.

The lower terminal member 3 includes a brush contact or spring contactwhich is secured to a web portion 2| extending between and supported bythe side portions 22 of the lower member 3. These side portions 22are'provided with hook like portions 23 for supporting the trunnions ofthe fuse structure. They are also provided with downwardly extendingabutments or stops 24 adapted to engage the bumpers of the fuse tube, aswill hereinafter appear.

A metal collar or member 25 is securely attached to the fuse tubeadjacent its lower portion and may be provided with a manipulatingmember 26 adapted to be received by a switch stick in the usual mannerfor replacing the fuse in its trunnions after re-fusing.

The collar 25 pivotally supports a lever 21 which is provided with armson opposite sides hinged .to the member 25 as indicated at 28. The lever21 is provided with a fiat rear face 29 against which the brush contact20 securely bears. The lower portion of the lever 21 is bifurcated asindicated at 30, see particularly Figure 4, and is provided with a pairof trunnions 3| projecting from opposite sides.

The lever 21 is also provided with a pair of rubber bumpers 32 locatedon opposite sides thereof intermediate the ends of the lever and carriedby outwardly projecting pins 33 rigid with the lever.

The trunnions 3| are removably received within the hook like supports23, as shown in Figures 1 and 2, and may be readily detached therefromwhen it is desired to remove the fuse tube for re-fusing, for instance.

A flip-out or fuse link extracting device, which may take the form of anauxiliary lever 34 see particularly Figure 3, is pivotally mountedbetween-the arms 3|] as by means ofa pin 35. A spring 36 is provided andloosely coiled about the pin and bears against the lever 21 and againstthe flip-out device or auxiliary lever 34, thus urging the flip-outdevice 34 in a clockwise direction, as viewed in Figure 3. The flip-outdevice 34 may be of channel shape and is of relatively light weight. Itis provided with an upturned forward end 31 and an upturned rear end 38.

The fuse link is looped over the flip-out device. For example the fuselink may comprise the upper buttonhead 39, the fusible section 46, andthe flexible leader section 4|. The flexible leader extends out of theopen lower end of the fuse tube and over the flip-out device 34. It isclamped to the lever 21 by means of the thumb nut 42, such thumbnutbeing/carried on a threaded pin rigid with the lever, as shownparticularly in Figures 3 and 4.

It is to be noted particularly from reference to Figures 3 and 4 thatthe lever 34 has rearwardly projecting side portions 43 which areadapted to engage a projection or web 44 formed on the lever 21 to thuslimit the outward rocking motion of the flip-out device 34 when releasedupon rupture' of the fuse link. Further,

the rearwardly projecting portions 43 serve as guides between which thefuse link is passed so that the fuse link may be led to the side of thelever 21 and clamped beneath the thumb nut 42, as shown most clearly inFigure 4.

The operation of the apparatus is as follows: Upon rupture of the fuselink, the flip-out device immediately operates and withdraws anyremaining portion of the fuse link substantially directly downwardly inline with the fuse tube.

This flip-out device operates very quickly as it has little mass and isspring urged to extract any remaining portion of the fuse link, and alsoas it operates independently of any motion of the lever 21 and fuse tubeI, so that these relatively more massive parts do not have to movebefore the flip-out device operates and thus a very quick interruptionof the circuit within the fuse tube is obtained even on light overloads.Obviously, on heavier overloads, the expulsion action is pronounced inaddition to the withdrawal of any remaining portion of the fuse link bythe flip-out device.

When the fuse link is ruptured, it is clear from an inspection of Figure1 that the lever 21 is also released and free to move with respect tothe fuse tube, thereby allowing the lower end of the fuse tube to moveoutwardly and downwardly and thus lowering the upper pin II and allowingit to pass from engagement with the shouldered portion l5 of the upperlatch |2. The fuse tube has been shown in successive positions in Figure2. It is apparent that when the fuse tube rocks to its final position,that the rubber bumpers or cushioning bumpers 32 will engage thestops'or abutments 24 of the lower support and will cushion thefall ofthe fuse tube.

The sequence of operations, it will be noted, is as follows:

First, upon rupture of the fuse link the flip-out device quicklyoperates and withdraws any remaining portion of the fuse linkindependently of any motion of the fuse tube or of the supporting lever21. Thereafter the fuse tuberocks outwardly and bodily removes itselffrom the electric circuit.

When it is desired to re-fuse the device, the

lineman engages the member 26 by means of a switch stick and lifts thefuse tube from the support, detaching the trunnions 3| from the hooks23. Thereafter a new fuse link is inserted in the fuse tube and drawnsecurely over the flip-out device 34 and clamped by means of the thumbnut 42. 'Any slack is taken up by means of the spring urged flip-outdevice 34.

The lineman repositions the trunnions 3| within the hooks 23 andthereafter disengages the switch stick from the member 26 and hooks theswitch stick into the eyelet portion l1 and rocks the fuse back into itsoperative position. The fuse link is not subjected to undue stress orshock due to the'sudden rocking of the fuse tube back motion by thedownward into operative position, for the spring pressed flip-out device84 serves to .cushion any shock due to this cause and to prevent itstransmission to the fuse link.

The fuse tube is biasedtowards open position by gravity and also by theoutward pressure of the spring contacts of the upper and lower terminalmembers, and also biased towards outward pressure from the uppe latch Hwhich may be urged downwardly either by gravity, as shown, or by meansof a spring.

It will also be seen that the flip-out device will operate without anyhindrance from other portions of the apparatus and independently of anymotion of any of the other portions of the apparatus. Thereafter, ashereinabove described, the fuse tube rocks outwardly to inoperativeposition.

It will thus be seen that the invention provides for the quickinterruption of the circuit within the fuse tube prior to the'parting ofeither the upper or lower stationary contacts with the upper and lowercontacts of the fuse tlf'Je. The upper and lower stationary springcontacts follow the contacts of the fuse tube outwardly a predetermineddistance after the fiip-out device has operated and thus pitting of thecontacts due to arcing is avoided, as the circuit is completelyinterrupted within the fuse tube prior to the moving of the contacts ofthe fuse tube away from the brush contacts.

It is to be noted also that the lower brush contact bears against thelever 21 at a point spaced upwardly a material distance from theflip-out device, and that attached directly to the flip-out device butis merely looped over-the flip-out device as shown.

In the form of the invention shown in Figures 6 and 7, a housed type ofdrop-out fuse is employed. The housing may be of porcelain or othersuitable material and is provided with a door 46 of insulating material,such as a phenolic condensation compound. If desired, the door may havethe usual eyelet so that the door and fuse tube assembly may be manuallypulled outwardly if desired.

The housing itself constitutes the supporting means for the upper andlower terminal members 41 and 48 and these upper and lower terminalmembers include the brush contacts 49 and 56. The upper terminal memberis also provided with a pair of spring arms 5i between which the uppercontact 52 of the fuse tube 53 is normally positioned. These spring armshave slanting portions 54 which are positioned in front of projectingpins 55 rigid with the upper contact 52, and thus serve as latchingmeans for retaining the fuse tube and door assembly normally in closedposition, such assembly dropping to open positionupon rupture of thefuse link as will hereinafter appear.

The fuse tube is provided with the upper cap 55 for clamping thebuttonhead of the fuse link in place as hereinbefore described.Preferably the upper contact 52 is provided with a spacing finger orbearing finger 51 that bears against the inner face of the door. Theupper portion of the door carries a pair of spring arms 56 between whichthe upper contact 52 of the fuse tube is received. These spring armshave an outwardly projecting cam portion indicated generally at 59 sothat when the door is manually pulled open, it will spread the arms 5|and allow the pins 55 to pass between such spring arms II. Further, inclosing the door, the cam porthe fuse link is not tions 59 of the springfingers ll spread the arms II and allow the pins 55 to pass inwardly toa position behind the spring arms ll. such arms thereafter movinginwardly towards each other and engaging the pins 55. This constructionis described in greater detail in Patent No. 2,073,186 of Alwin G.Steinmayer and-William 0. Schultz, issued March 9. 1937, for Housed typeof dropout fuse.

The fuse tube 58 carries a collar 56 rigidly secured thereto in anysuitable and the collar is pivoted to a pair of arms 6| carried by thedoor. The pivoting is secured by means ofthe pins or screws 62 whichalso serve to pivot the lever 81 to the collar 50.

- A leaf spring 64 bears against the lower portion of the fuse tube andtends to rock the fuse tube about the pivot 62 and to hold the finger 51in contact with the upper inner side of the door, as shown in Figure 6.When the door is manually pulled open, there is relative rocking motionbetween the fuse tube and the door to allow the cam portions 55 of thespreader fingers 58 to spread the spring members 5| to allow the whichis manner v door and fuse tube assembly to be manually pulled open.

The lever 63 is provided with a pair of side arms 65 equipped withtrunnions 66 which are removably received within the hook supports 51.The hook supports are distinct and separate from the lower contact, asshown in Figure 6, and are carried by the body portion 45. They areprovided with inwardly projecting portions 6! which constitute stops andalso about which hooked extensions 69 of thelever 63 pass to prevent thetrunnions 66 from being inadvertently detached from the hook supports 61when the fuse tube and door assembly has dropped to open position.

If desired, and as shown in Figure 6, the lever 63 may be of channelshape andprovides a fiat rear face 10 against which the lower brushcontact 50 bears. This lever is also provided with a threaded stem uponwhich the lock nut II is screwed to clamp the leader 12 of the fuse linkin place.

A flip-out or fuse link extracting device which may take the form of anauxiliary lever II is pivotally mounted as indicated at 14 between theside arms 65 of the lever 63 and is spring urged in a clockwisedirection by means of the spring 15. turned forward and rear ends, asshown and as previously described, and with the side portions orextensions I5. These extensions are adapted to engage a transverse web11 formed on the lever 63 and thus limit outward rocking motion of theflip-out device.

When the fuse link ruptures upon overload, the flip-out device firstquickly operates and withdraws any remaining portion of the fuse linksubstantially directly downwardly in line with the fuse tube. Thereafterthe fuse tube and door assembly rock outwardly, the lever 58 pivoting inthe hook-shaped members 61 and moving the lower end of the fuse tube anddoor assembly downwardly and outwardly, thus allowing the upper pins 55to slide outwardly from the slanting portions 54 of the spring arms II.

It will be seen that the housing itself in this last form of theinvention constitutes the support for the upper and lower terminals andfor the fuse tube and door assembly. Also it will be seen that the hooksupports 61 are electrically dead after the fuse tube and door assemblyhave dropped outwardly from the housing.

It may be provided with upwardly ing aconstruction having Further it isto be noted that the quick action of the fiipout device serves toquickly extract any remaining portion of the fuse link and to thusquickly interrupt the circuit within the fuse tube prior to separationof either the upper or lower contact of the fuse tube from thestationary contacts and thus prevents'pitting.

The fuse tube and door assembly may be detached from the hook supportsti and the device may be re-fused and thereafter replaced. The trunnionsare repositioned within the hook supports bl and the fuse tube and doorassembly are rocked back into position. 7

It is to he noted the flip-out device l3 serves to take up any slack inthe fuse link and also to cosluon any due to the sudden closing of thedevice It is obvious that device may be mounted either verticall; asshown in Figure 6, or in the slanting position as shown in Figure '3.

it will be seen that novel forms of expulsion drop-out fuses have beenprovided by this invention in which iiip cut device is employed whichhas motion idependently of the supporting lever and aui withdraws anyremaining portion of the e 1k upon rupture of the fuse linksubstantially in line with the fuse tube. This, as previously described,allows the use of less flexible leaders if so desired.

The flip-out device operates independently of any acceleration that maybe imparted to the relatively more massive moving parts of the deviceandthue insures a very quick action and a complete extinguishing of theare within the fuse tube prior to the parting oi the contacts of thefuse tube from the stationary contacts.

In each of the forms of the invention, the fuse link has been shown aslooped over the flip-out device and the attaching means for the fuselink has been shown as carried by the supporting lever. This is the mostdesirable construction as it makes for ease in re-fusing and as itallows the mass of the flip-out device to be kept at a minimum.

However, it is within the province of this invention to thread the fuselink throughia hole in the flip-out device 36 as shownin Figures 8 and9. Under these conditions, it is clear that a portion of the fuse linkwould necessarily be looped over the flip-out device, thereby providthesame characteristics as that illustrated in so far as a portion of thefuse link would be looped over a part of the flip-out device to therebycause the flip-out device to bear against the fuse link and extract thefuse link as it does in the illustrated forms. A little more dificultywould be experienced in positioning the fuse link and this, therefore,is not the preferred form of construction. 7

Additionally, in any form of the invention, the locking thumb nut 32 forthe fuse link could be carried directly by the flip-out device 35" asshown in Figures 10 and 11, but this obviously is not as desirable aconstruction as that illustrated. It would increase the mass of theflipout device and also there would not be the direct electricalconnection between the fuse link and the lever, which constitutes one ofthe terminals of the device and bears directly against the lowerbrush'contact. However, these constructions are obviously within thescope of this invention and can be resorted to if so desired withoutdeparting from the spirit of the invention.

Although this invention has been described in considerable detail, it isto be understood that aecaiso such description is intended asillustrative rather than limiting, as the invention may be variouslyembodied and is to be interpreted as claimed.

I claim:

1. A drop-out fuse construction comprising upperland lower stationaryterminals, a fuse tube having an upper end detachably locked to saidupper stationary terminal, a lever supporting said fuse tube fordrop-out motion, said lever being pivoted at one end to said fuse tubeand pivotally supported at its other end, said upper and lower terminalsincluding upper and lower stationary contacts, a fuse link withinsaid'fuse tube electrically connecting said upper and lower contacts andnormally restraining said lever against motion, and a fuse link flip-outdevice movably carried by said lever and over which said fuse link islooped.

2. A drop-out fuse construction comprising upper and lower stationaryterminals, a fuse tube having an upper end detachably locked to said Iupper stationary terminal, a lever supporting said fuse tube fordrop-out motion, said lever being pivoted at one end to said fusetubeand pivotally supported at its other end, said upper and lower terminalsincluding upper and lower stationary contacts, a fuse link within saidfuse tube electrically connecting said upper and lower contacts andnormally restraining said lever against motion, a fuse link flip-outdevice movably carried by said lever and over which said fuse link islooped, and a spring biasing said flipout device for movementindependently of said lever.

3. A drop-out fuse construction comprising upper and lower stationaryterminals, a fuse tube having an upper contact normally engaging saidupper stationary terminal and detachably interlocking therewith, a leversupporting said fuse tube for drop-out motion, said lever having one endpivoted to said fuse tube and having its other end plvotally supported,a fuse link within said fuse tube extending from the upper contact ofsaid fuse tube to said lever and normally restraining said lever againstmotion, a. fuse link flip-out device carried by said lever and havingmotion independently of said lever, said fuse link being looped oversaid flip-out device, and means biasing said flip-out device for quickmotion.

4. A drop-out fuse construction comprising upper and'lower stationaryterminals, a fuse tube having an upper contact normally engaging saidupper stationary terminal and detachably interlocking therewith, a leversupporting said fuse tube for drop-out motion, said lever having one endpivoted to said fuse tube and having its other end pivotally supported,said lower stationary terminal including yielding contact means bearingagainst said lever, a fuse link within said fuse tube extending from theupper i contact of said fuse tube to said lever and normally restrainingsaid lever against motion, a fuse link flip-out device carried by saidlever and having motion independently of said lever, said fuse linkbeing looped over said flip-out device, and means biasing said flip-outdevice for quick motion.

5. A drop-out fuse construction comprising upper and lower stationaryterminals, said upper stationary terminal including latch means, a fusetube having an upper contact normally engaging said upper stationaryterminal and detachably interlocking with said latch means, a leversupporting said fuse tube for drop-out motion, said lever beingpivotally supported adjacent oneend and pivoted adjacent its other endto said fuse tube, a fuse link-within said fuse tube extending from theupper contact of said fusetube to said lever and normally restrainingsaid lever against mo tion, a fuse link flip-out device carried by saidlever and having motion independently of said lever, said fuse linkbeing looped over said flipout device, and means biasing said flip-outdevice for motion independently of said lever.

6. A drop out 'fuse construction comprising 7 support means having upperand lower stationary portions, an upper stationary contact carried bysaid upper stationary portion, a fuse tube having an uppercontactylatch'means carried by said stationary portion and pivoted atits other end I to said fus'e tube for guiding the lower end of saidfuse tube downward ly to detach said fuse tube from said latch means, afuse link extending from the upper contact of'said fuse tube to said'lever and secured to said lever and normally restraining said lever, afuse link flip-out device movably carried by said lever and over whichsaid fuse link is looped, and a lower stationary contact carried by saidlower stationary portion andyieldingly engaging said lever at a pointspaced from said fuse link flip-out device.

'7. A drop-out fuse construction comprising a stationary portion, anupper stationary contact carried by said stationary portion, a fuse tubehaving an upper contact, latch means carried by said stationary portionand detachably engaging the upper end of said fuse-tube and holding theupper contact of said fuse tube in engagement with said upper stationarycontact, a normally substantially vertical lever pivotally supportedadjacent its lower end from said stationary portion and pivoted adjacentits upper end to said fuse tube for guiding the'lower end of said fusetube-downwardly andoutwardly to detach said fuse tube from said latchmeans, a fuse stationary portion, an upper stationary contact linkextending from the upper contact of said j fuse tube to said lever, saidfuse link being attached to said lever and normally restraining saidlever against motion, and a fuse link flip-out device carried by saidlever and over which said fuse link is looped.

8. A drop-out fuse construction comprising a stationary portion, anupper stationary contact carried by said stationary portion, a fuse tubehaving an upper contact, latch means carried by said stationary portionand detachably engaging the upper end of said fuse tube and holding theupper contact of said fuse tube in engagement with said upper stationarycontact, a normally substantially vertical lever pivotally supportedadjacent its lower end from said stationary portion and pivoted adjacentits upper end to said fuse tube for guiding the lower end of said fusetube downwardly and outwardly to detach said fuse tube from said latchmeans, a fuse link extending from the upper contact of said fuse tube tosaid levei', said fuse link being attached to said lever and normallyrestraining said lever against motion, a fuse link flip-out devicecarried by said lever and over which said fuse link is looped, and alower stationary contact carried by said stationary portion andyieldingly engaging said lever at a point above said fuse link flip-outdevice.

9. A drop-out fuse construction comprising a having an upper contact,latch means carried by said stationary portion and detachably engagingthe upper end of said fuse tube and holding the upper contact of saidfuse tube in engagement with said upper stationary contact, a

normally substantially vertical lever pivotally supported adjacent itslower end from said stationary portion and pivoted adjacent its upperend to said fuse tube for guiding the lower end of said fuse tubedownwardly and outwardly to detach said fuse tube from said latch means,a

fuse link extending from the upper contact of said fuse tube to saidlever, said fuse link being attached to said lever and' normallyrestraining said lever against motion, a fuse link flip-out devicecarried by said lever and over which said fuse link is looped, and alower stationary contact carried by said stationary portion andyieldingly engaging said lever at a point above said fuse link flip-outdevice, said upper and lower stationary contacts maintaining engagement,withthe upper contact of said fuse tube and with said leverrespectively while said fuse link flip-out device operates, wherebypitting of either contact is avoided. g

10. A drop-out fuse construction comprising a stationary portion havingan upper contact,

a fuse tube having an upper contact, latch means carried by saidstationary portion for holding the upper contact of said fuse tube inengagement with the upper stationary contact, a substantially verticallever pivotally supported adjacent its lower end from said supportingmeans and pivoted adjacent its upper end to said fuse tube for guidingthe lower end of said fuse tube outwardly and downwardly to detach-theupper end thereof from said latch means, a lower contact normallyengaging said lever, a fuse link flip-out device pivotally mounted onsaid lever adjacent the lower end thereof and spring urged outwardly formotion independently of said lever, a fuse link within said fuse tubnormally electrically connecting the upper contact of said fuse tubewith said lever and looped over said fuse link flip-out device, andmeans carried on the side of said lever for attaching said fuse link tosaid lever.

11. A drop-out fuse construction comprising a stationary portion havingan upper ontact, a fuse tube having an upper contact, latch meanscarried by said stationary portion for holding the upper contact of saidfuse tube in engagement with the upper stationary contact, asubstantially vertical lever pivotally supported adjacent its lower endfrom said supporting means and pivoted adjacent its upper end to saidfuse tube for guiding the lower end of said fuse tube outwardly anddownwardly to detach the upper end thereof from said latch means, alower contact normally engaging said lever, a fuse link flip-out devicepivotally mounted on said lever adjacent the lower end thereof andspring urged outwardly for motion independently of said lever, a

' fuse link within said fuse tube normally electrically connecting theupper contact of said fuse tube with said leverand looped over said fuselink flip-out device, and means carried on the rear side of said leverfor attaching said fuse link to said lever.

12. An open type drop-out fuse construction comprising supporting means,upper and lower insulators carried by said supporting means, upper andlower terminal members carried by saidupper and lower insulatorsrespectively, each of said mally engaging the upper stationary contact,

latch means supported from said upper insulator for locking the uppercontact of said fuse tube in engagement with the upper stationarycontact,

a substantially vertical lever having laterally projecting trunnionspivotally supported from said lower terminal member and having its upperend pivoted to said fuse tube, a fuse link fiip-out lever pivoted tosaid first mentioned lever, a spring between said first mentioned leverand said fuse link flip-out lever, and a fuse link extending throughsaid fuse tube from the upper contact of said fuse tube to said firstmentioned lever and attached to said first mentioned lever, said fuselink being looped over said fuse link flip-out lever.

13. A housed type drop-out fuse device comprising a housing having upperand lower terminal members provided respectively with upper and lowerstationary contacts, a fuse tube having an upper contactnormally inengagement with said upper stationary contact, latch means for latchingthe upper contact of said fuse tube in engagement with said upperstationary contact, pivot support means spaced downwardly below saidlower terminal member, a lever pivoted to said pivot support meansadjacent the lower end of the lever and pivoted to said fuse tubeadjacent the upper end of said lever, said lever being normally incontact with the lower stationary contact, a fuse link flip-out leverpivotally carried adjacent the lower portion of said first mentionedlever, a spring urging said fuse link flip-out lever towards motionindependently of said first mentioned lever, and a fuse link within saidfuse tube extending from the upper contact of said fuse tube to saidfirst mentioned lever and secured to said first mentioned lever, saidfuse link being looped over said fuse link flip-out ever.

14. A drop-out fuse construction comprisingupper and lower stationaryterminals, a fuse tube having an upper end detachably locked to saidtrically connecting said upper and lower contacts and normallyrestraining said lever against motion, and a fuse link flip-out devicemovably carried by the lever and engaging 'a portion of the fuse link towithdraw the fuse link upon rupture thereof.

15. A drop-out fuse construction comprising upper and lower stationaryterminals, a fuse tube having an upper end detachably locked to saidupper stationary terminal, a lever, supporting said fuse tube fordrop-out motion, said lever being pivoted at one end to said fuse tubeand pivotally supported at its other end, said upper and lower terminalsincluding upper and lower stationary contacts, a fuse link within saidfuse tube electrically connecting said upper and lower contacts andnormally restraining said lever against motion, a fuse link flip-outdevice movably carried by the lever and engaging. a portion of the fuselink to withdraw the fuse link upon rupture thereof, and a springbiasing said fiipout device for movement independently of said lever.

16. A drop-out fuse construction comprising support means having upperand lower stationary portions, an upper stationary contact carried bysaid upper stationary portion, a fuse tube having an'upper contact,latch means carried by said upper stationary portion and detachablyengaging the upper end of said fuse tube and normally holding the uppercontact of said fuse tube in engagement with the upper stationarycontact, a lever pivotally supported at one end from said stationaryportion and pivoted at its other end to said fuse tube for guiding thelower end of said fuse tube downwardly to detach said fuse tube fromsaid latch means, a fuse link within said fuse tube electricallyconnecting the upper contact of said fuse tube to said lever, a fuselink flip-out device movably carried by said lever and engaging saidfuse link, and a lower stationary contact carried by said lowerstationary portion and yleldingly engaging said lever at a point spacedfrom said fuse link flip-out device.

WILLIAM O. SCHULTZ.

